Highgear TechTrail 3 - Manual (Page 6)

How to Use Electronic Compass Feature:
Press S1 to take compass reading.For accurate reading,make
sure to level the compass using leveling bubble.
Caution: The Digital Compass function is very sensitive to magnetic
and electric fields. The direction will be affected by nearby
magnetic or electronic devices.
Calibration: Allows user to align the Compass magnetic sensor
with the earth’s magnetic field so that the Compass can detect
correct direction. With the declination angle added, magnetic
North will be adjusted by the clockwise shift or anti-clockwise shift
of this angle,giving you the true North reading. The range of
declination angle is 00
° E to 99°E and 00° W to 99° W. The
declination angles for major world cities are listed below:
Declination: The difference in degrees, or angle, between true
North and magnetic North.
True North: Also know as geographic North, this is map
North(North Pole)
Magnetic North: The geographical region toward which all
magnetic needles point. This point is 1300 miles south of true
North.
(This is why it’s important to calibrate!)
City Declination Angle
Anchorage 22 ° E
Atlanta 4 ° W
Bombay 1 ° W
Boston 16 ° W
Calgary 18 ° W
Chicago 5 ° W
Denver 10 ° E
Jerusalem 3 ° E
London 4 ° W
Little Rock 3 ° E
Livingston, MT 14 ° E
Munich 1 ° E
New York City 14 ° W
Orlando 5 °W
Oslo 2 ° W
Paris 2 ° W
Rio De Janeiro 21 ° W
San Francisco 15 ° E
Seattle 19 ° E
Shanghai 5 ° W
Toronto 11 ° W
Vancouver 20 ° W
Washington DC 10 ° W
Waterbury, CT 14 ° W
To locate declination angle in your city not listed in this chart, go to
www.ngdc.noaa.gov.